<TITLE>putenv</TITLE>
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<h3>PUTENV(3)           Linux Programmer's Manual           PUTENV(3)
</h3>

<h3>NAME
</h3>       putenv - change or add an environment variable

<h3>SYNOPSIS
</h3>       #include &lt;stdlib.h&gt;

       int putenv(const char *string);

<h3>DESCRIPTION
</h3>       The  putenv()  function adds or changes the value of envi-
       ronment variables.  The argument string  is  of  the  form
       name = value.  If name does not already exist in the envi-
       ronment, then string is added to the environment.  If name
       does  exist,  then the value of name in the environment is
       changed to value.

<h3>RETURN VALUE
</h3>       The putenv() function returns zero on success, or -1 if an
       error occurs.

<h3>ERRORS
</h3>       ENOMEM Insufficient space to allocate new environment.

<h3>CONFORMING TO
</h3>       SVID 3, POSIX, BSD 4.3

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<h3>SEE ALSO
</h3><p>
<a href=getenv.htm>getenv</a>, 
<a href=setenv.htm>setenv</a>, 
<a href=unsetenv.htm>unsetenv</a>, 
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<h3>GNU                       April 8, 1993                         1
</h3>

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